WO2008036046A1 - COMPOSÉS D'HYDROXYMATE D'IMIDAZO[l,2-a]PYRIDINE QUI SONT DES INHIBITEURS D'HISTONE DÉSACÉTYLASE - Google Patents

COMPOSÉS D'HYDROXYMATE D'IMIDAZO[l,2-a]PYRIDINE QUI SONT DES INHIBITEURS D'HISTONE DÉSACÉTYLASE Download PDF

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WO2008036046A1
WO2008036046A1 PCT/SG2006/000277 SG2006000277W WO2008036046A1 WO 2008036046 A1 WO2008036046 A1 WO 2008036046A1 SG 2006000277 W SG2006000277 W SG 2006000277W WO 2008036046 A1 WO2008036046 A1 WO 2008036046A1
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Prior art keywords
methyl
butyl
acrylamide
hydroxy
imidazo
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PCT/SG2006/000277
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English (en)
Inventor
Ken Chi Lik Lee
Eric T. Sun
Haishan Wang
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S*Bio Pte Ltd
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Priority to ES06784289.8T priority Critical patent/ES2561835T3/es
Priority to EP06784289.8A priority patent/EP2064211B1/fr
Priority to PCT/SG2006/000277 priority patent/WO2008036046A1/fr
Publication of WO2008036046A1 publication Critical patent/WO2008036046A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents

Definitions

  • the present invention relates to hydroxamate compounds that are inhibitors of histone 5 deacetylase (HDAC). More particularly, the present invention relates to imidazo[1 ,2- a]pyridine containing compounds and methods for their preparation. These compounds may be useful as medicaments for the treatment of proliferative disorders as well as other diseases involving, relating to or associated with enzymes having histone deacetylase (HDAC) activities.
  • HDAC histone deacetylase
  • chromatin architecture is generally recognized as an important factor in the regulation of gene expression.
  • the architecture of chromatin, a protein-DNA complex, is strongly influenced by post-translational modifications of the histones which are the
  • HDACs histone deacetylases
  • HDACs histone acetylases
  • acetyl transferase together control the level of acetylation of histones to maintain a balance.
  • Inhibition of HDACs results in the accumulation of acetylated histones, which results in a variety of cell type dependent cellular responses, such as apoptosis, necrosis, differentiation, cell survival, inhibition of
  • SAHA suberoylanilide hydroxamic acid
  • Trichostatin A is a reversible inhibitor of mammalian HDAC.
  • Trapoxin B is a cyclic tetrapeptide, which is an irreversible inhibitor of mammalian HDAC.
  • HDAC inhibitors due to the in vivo instability of these compounds they are less desirable as anti-cancer drugs.
  • Other small molecule HDAC inhibitors have become available for clinical evaluation [US6,552,065]. Additional HDAC inhibiting compounds have been reported in the literature [Bouchain G. et al, J. Med.
  • HDAC inhibitors have been reported to interfere with neurodegenerative processes, for instance, HDAC inhibitors arrest polyglutamine-dependent neurodegeneration [Nature, 413(6857): 739-43, 18 October, 2001].
  • HDAC inhibitors have also been known to inhibit production of cytokines such as TNF, IFN, IL-1 which are known to be implicated in inflammatory diseases and/or immune system disorders. [ J. Biol. Chem.
  • the present invention provides a compound of the formula (I):
  • R 1 is alkyl which may be optionally substituted with one or more substituents selected from the group consisting of F, Br, I 1 OH, SH, OCF 3 , OR 6 , SR 6 , amino, NR 7 R 8 , cycloalkyl, and NO 2 ;
  • R 2 is H or alkyl which may be optionally substituted with one or more substituents selected from the group consisting of F, Br, I, OH, SH, OCF 3 , OR 6 , SR 6 , amino, NR 7 R 8 , cycloalkyl, and NO 2 ;
  • R 3 is alkyl which may be optionally substituted with one or more substituents selected from the group consisting of F, Br, I 1 OH, SH, OCF 3 , OR 6 , SR 6 , amino, NR 7 R 8 , cycloalkyl, and NO 2 ;
  • R 4 is selected from the group consisting of: H 1 alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;
  • R 5 is selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;
  • each R 8 is independently selected from the group consisting of: H, alkyl, cycloalkyl, heterocycloalkyl, aryl and heteroaryl, each of which may be optionally substituted;
  • R 2 is H or CrC ⁇ alkyl. In another embodiment of the invention R 2 is H or C 1 -C 4 alkyl. This provides compounds of formula (II) and (III).
  • R , R , R and R are as defined above.
  • R 1 , R 3 , R 4 and R 5 are as defined above.
  • R 2 is selected from the group consisting of methyl, ethyl, propyl and butyl. This provides compounds of formula (Ilia) - (HId)
  • R 1 , R 3 , R 4 and R s are as defined above.
  • R , R , R 4 and R are as defined above.
  • R 1 , Fr, R 4 and R 5 are as defined above.
  • R 1 , R 3 , R 4 and R 5 are as defined above.
  • R 1 is C 1 -C 10 alkyl. In other embodiment R 1 is C 1 -C 5 alkyl. In another embodiment R 1 is selected from the group consisting of methyl, ethyl, propyl, isopropyl, 2-methyl-propyl, 2,2-dimethyl-propyl, butyl, tert-butyl, 3-methyl-butyl, and pentyl, each of which may be optionally substituted. Specific examples of R 1 include methyl, ethyl, propyl, 2-methyl-propyl, t-butyl, butyl, 3- methyl-butyl, and pentyl.
  • R 3 is C 1 -C 10 alkyl. In another embodiment of the invention R 3 is selected from the group consisting of methyl, ethyl, propyl, isopropyl, 2- methyl-propyl, 2,2-dimethyl-propyl, butyl, tert-butyl, 2-ethyl-butyl, 3-methyl-butyl, 3,3- dimethyl-butyl, pentyl, 2-methyl-pentyl, 3-methyl-pentyl, 4-methyl-pentyl, 2,4,4-trimethyl- pentyl, 3,5,5-trimethyl-pentyl and hexyl.
  • R 2 and R 3 are selected such that the sum of
  • X + Y is an integer greater than or equal to 5. In another embodiment of the invention if the total number of carbon atoms in R 2 is X and the total number of carbon atoms in R 3 is
  • R 2 and R 3 are selected such that the sum of X + Y is an integer selected from the group consisting of 6, 7 and 8. In one embodiment of the invention the sum of X + Y is 6. In another embodiment of the invention the sum of X + Y is 7. In another embodiment of the invention the sum of X + Y is 8.
  • R 1 and R 3 are selected such that the sum of Z + Y is an integer greater than or equal to 5.
  • R 1 and R 3 are selected such that the sum of Z + Y is an integer selected from the group consisting of 6, 7, 8 and 9.
  • the sum of Z + Y is 6.
  • the sum of Z + Y is 7.
  • the sum of Z + Y is 8.
  • the sum of Z + Y is 9.
  • R 1 is not methyl.
  • R 1 is not t-butyl.
  • R 1 is not t- butyl.
  • R 4 is H.
  • R 5 is H.
  • R 2 and R 3 are selected such that the group -CH 2 NR 2 R 3 is selected from the group consisting of:
  • HDAC inhibiting agents are at times collectively referred to herein as "HDAC inhibiting agents" or
  • HDAC inhibitors used to modify deacetylase activity, in some cases histone deacetylase activity and in some cases HDAC
  • compositions each comprising a therapeutically effective amount of a HDAC inhibiting agent of the embodiments described with a pharmaceutically acceptable carrier or diluent for treating cellular proliferative ailments.
  • effective amount indicates an amount necessary to administer to a host to achieve a therapeutic result, e.g., inhibition of proliferation of malignant cancer cells, benign tumor cells or other proliferative cells.
  • the invention also relates to pharmaceutical compositions including a compound of the invention with a pharmaceutically acceptable carrier, diluent or excipient.
  • the present invention provides a method of treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis including administration of a therapeutically effective amount of a compound of formula (I).
  • the disorder is selected from the group consisting of but not limited to cancer (e.g. breast cancer, colon cancer, prostate cancer, pancreatic cancer, leukemias, lymphomas, ovarian cancers, neuroblastomas, melanoma, inflammatory diseases/immune system disorders, angiofibroma, cardiovascular diseases (e.g. restenosis, arteriosclerosis), fibrotic diseases (e.g. liver fibrosis), diabetes, autoimmune diseases, chronic and acute neurodegenerative disease like disruptions of nerval tissue, Huntington's disease and infectious diseases like fungal, bacterial and viral infections.
  • the disorder is a proliferative disorder.
  • the proliferative disorder is preferably cancer.
  • the cancer can include solid tumors or hematologic malignancies.
  • the invention also provides agents for the treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis including a compound of formula (I) as disclosed herein.
  • the agent is an anti- cancer agent.
  • the agent is an anti-angiogenesis agent.
  • the invention also relates to the use of compounds of formula (I) in the manufacture of a medicament for the treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis.
  • the disorder is a proliferative disorder, such as a cancer.
  • the invention provides the use of a compound of formula (I) to modify deacetylase activity.
  • the deacetylase activity is histone deacetylase activity.
  • the deacetylase activity is class I histone deacetylase activity.
  • the histone deacetylase is HDAC1.
  • the invention provides a method of treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase including administration of a therapeutically effective amount of a compound of formula (I).
  • the disorder is selected from the group consisting of but not limited to Proliferative disorders (e.g. cancer); Neurodegenerative diseases including Huntington's Disease, Polyglutamine diseases, Parkinson's Disease, Alzheimer's Disease, Seizures, Striatonigral degeneration, Progressive supranuclear palsy, Torsion dystonia, Spasmodic torticollis and dyskinesis, Familial tremor, Gilles de Ia Tourette syndrome, Diffuse Lewy body disease, Pick's disease, Intracerebral haemorrhage, Primary lateral sclerosis, Spinal muscular atrophy, Amyotrophic lateral sclerosis, Hypertrophic interstitial polyneuropathy, Retinitis pigmentosa, Hereditary optic atrophy, Hereditary spastic paraplegia, Progressive ataxia and Shy-Drager syndrome; Metabolic diseases including Type 2 diabetes; Degenerative Diseases of the Eye including Glaucoma, Age-related macular degeneration, macular myopic degeneration,
  • the invention also provides agents for the treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase including a compound of formula (I) as disclosed herein.
  • the agent is an anti-cancer agent.
  • the invention also relates to the use of compounds of formula (I) in the manufacture of a medicament for the treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase.
  • the invention also provides a method for inhibiting cell proliferation including administration of an effective amount of a compound according to formula (I).
  • the invention also provides agents for inhibiting cell proliferation including a compound of formula (I) as disclosed herein.
  • the invention also relates to the use of compounds of formula (I) in the manufacture of a medicament for inhibiting cell proliferation.
  • the invention provides a method of treatment of a neurodegenerative disorder in a patient including administration of a therapeutically effective amount of a compound of formula (I).
  • the neurodegenerative disorder is Huntington's Disease.
  • the invention also provides agents for the treatment of a neurodegenerative disorder including a compound of formula (I) as disclosed herein.
  • the agent is an anti-Huntington's disease agent.
  • the invention also relates to the use of compounds of formula (I) in the manufacture of a medicament for the treatment of a neurodegenerative disorder.
  • the neurodegenerative disorder is Huntington's Disease.
  • the invention provides a method of treatment of an inflammatory disease and/or immune system disorder in a patient including administration of a therapeutically effective amount of a compound of formula (I).
  • the inflammatory disease and/or immune system disorder is rheumatoid arthritis.
  • the inflammatory disease and/or immune system disorder is Systemic Lupus Erythematosus.
  • the invention also provides agents for the treatment of inflammatory disease and/or immune system disorder including a compound of formula (I) as disclosed herein.
  • the invention also relates to the use of compounds of formula (I) in the manufacture of a medicament for the treatment of inflammatory disease and/or immune system disorder.
  • the inflammatory disease and/or immune system disorder is rheumatoid arthritis.
  • the inflammatory disease and/or immune system disorder is Systemic Lupus Erythematosus.
  • the invention provides a method of treatment of eye disease mediated by HDAC inhibition in a patient including administration of a therapeutically effective amount of a compound of formula (I).
  • the eye disease is macular degeneration.
  • the eye disease is glaucoma.
  • the eye disease is retinal degeneration.
  • the invention also provides agents for the treatment of eye disease mediated by HDAC inhibition including a compound of formula (I).
  • the eye disease is macular degeneration.
  • the eye disease is glaucoma.
  • the eye disease is retinal degeneration.
  • the invention also relates to the use of compounds of formula (I) in the preparation of a medicament for the treatment of eye disease mediated by HDAC inhibition.
  • the eye disease is macular degeneration.
  • the eye disease is glaucoma.
  • the eye disease is retinal degeneration.
  • the invention also relates to a method of treatment of a proliferative disorder in patient including administration of a therapeutically effective amount of a compound according to formula (I) to the patient.
  • the invention also relates to the use of a compound of formula (I) in the manufacture of a medicament for the treatment of a proliferative disorder.
  • the invention also relates to a method of treatment of cancer in patient including administration of a therapeutically effective amount of a compound of formula (I) to the patient.
  • the cancer is a hematologic malignancy.
  • the hematologic malignancy is selected from the group consisting of B-cell lymphoma, T- cell lymphoma and leukemia.
  • the cancer is a solid tumor.
  • the solid tumor is selected from the group consisting of breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer, gastric cancer, colon cancer, pancreatic cancer and brain cancer.
  • the invention also provides agents for the treatment cancer including a compound of formula (I).
  • the cancer is a hematologic malignancy.
  • the hematologic malignancy is selected from the group consisting of B-cell lymphoma, T-cell lymphoma and leukemia.
  • the cancer is a solid tumor.
  • the solid tumor is selected from the group consisting of breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer, gastric cancer, colon cancer, pancreatic cancer and brain cancer.
  • the invention also relates to the use of a compound of formula (I) in the manufacture of a medicament for the treatment of cancer.
  • the cancer is a hematologic malignancy.
  • the hematologic malignancy is selected from the group consisting of B-cell lymphoma, T-cell lymphoma and leukemia.
  • the cancer is a solid tumor.
  • the solid tumor is selected from the group consisting of breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer, gastric cancer, colon cancer, pancreatic cancer and brain cancer.
  • hydroxamate compounds for example imidazo[1,2-a]pyridine containing hydroxamic acid in one of the substituents, that may be inhibitors of deacetylases, including but not limited to inhibitors of histone deacetylases.
  • the hydroxamate compounds may be suitable for prevention or treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis when used either alone or together with a pharmaceutically acceptable carrier, diluent or excipient.
  • a pharmaceutically acceptable carrier diluent or excipient.
  • An example of such a disorder is cancer.
  • 'cancer' is a general term intended to encompass the vast number of conditions that are characterised by uncontrolled abnormal growth of cells.
  • the compounds of the invention will be useful in treating various cancers including but not limited to bone cancers including Ewing's sarcoma, osteosarcoma, chondrosarcoma and the like, brain and CNS tumours including acoustic neuroma, neuroblastomas, glioma and other brain tumours, spinal cord tumours, breast cancers, colorectal cancers, advanced colorectal adenocarcinomas, colon cancers, endocrine cancers including adenocortical carcinoma, pancreatic cancer, pituitary cancer, thyroid cancer, parathyroid cancer, thymus cancer, multiple endocrine neoplasma, gastrointestinal cancers including stomach cancer, esophageal cancer, small intestine cancer, Liver cancer, extra hepatic bile duct cancer, gastrointestinal carcinoid tumour, gall bladder cancer, genitourinary cancers including testicular cancer, penile cancer, prostate cancer, gynaecological cancers including cervical cancer
  • Exemplary cancers that may be treated by the compounds of the present invention are breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer (e.g. renal cell carcinoma), gastric cancer, colon cancer, colon cancer, colorectal cancer and brain cancer.
  • renal cancer e.g. renal cell carcinoma
  • Exemplary cancers that may be treated by compounds of the present invention include but are not limited to B-cell lymphoma (e.g. Burkitt's lymphoma), leukemias (e.g. Acute promyelocytic leukemia), cutaneous T-cell lymphoma (CTCL) and peripheral T-cell lymphoma.
  • Exemplary cancers that may be treated by compounds of the present invention include solid tumors and hematologic malignancies.
  • the compounds may also be used in the treatment of a disorder involving, relating to or, associated with dysregulation of histone deacetylase (HDAC).
  • HDAC histone deacetylase
  • HDAC activity is known to play a role in triggering disease onset, or whose symptoms are known or have been shown to be alleviated by HDAC inhibitors.
  • disorders of this type that would be expected to be amenable to treatment with the compounds of the invention include the following but not limited to: Proliferative disorders (e.g.
  • Neurodegenerative diseases including Huntington's Disease, Polyglutamine diseases, Parkinson's Disease, Alzheimer's Disease, Seizures, Striatonigral degeneration, Progressive supranuclear palsy, Torsion dystonia, Spasmodic torticollis and dyskinesis, Familial tremor, Gilles de Ia Tourette syndrome, Diffuse Lewy body disease, Pick's disease, Intracerebral haemorrhage, Primary lateral sclerosis, Spinal muscular atrophy, Amyotrophic lateral sclerosis, Hypertrophic interstitial polyneuropathy, Retinitis pigmentosa, Hereditary optic atrophy, Hereditary spastic paraplegia, Progressive ataxia and Shy-Drager syndrome; Metabolic diseases including Type 2 diabetes; Degenerative Diseases of the Eye including Glaucoma, Age-related macular degeneration, macular myopic degeneration, Rubeotic glaucoma, Interstitial keratitis, Diabetic retinopathy, Peter
  • Alkyl as a group or part of a group refers to a straight or branched aliphatic hydrocarbon group, preferably a Ci-C-
  • suitable straight and branched CpC ⁇ alkyl substituents include methyl, ethyl, n-propyl, 2-propyl, n-butyl, sec-butyl, t-butyl, hexyl, and the like.
  • Alkenyl as group or part of a group denotes an aliphatic hydrocarbon group containing at least one carbon-carbon double bond and which may be straight or branched preferably having 2-14 carbon atoms, more preferably 2-12 carbon atoms, most preferably 2-6 carbon atoms, in the chain.
  • the group may contain a plurality of double bonds in the normal chain and the orientation about each is independently E or Z.
  • Exemplary alkenyl group include, but are not limited to, ethenyl and propenyl.
  • Alkynyl as a group or part of a group means an aliphatic hydrocarbon group containing a carbon-carbon triple bond and which may be straight or branched preferably having from 2-14 carbon atoms, more preferably 2-12 carbon atoms in the chain, preferably 2-6 carbon atoms in the chain.
  • Exemplary structures include, but are not limited to, ethynyl and propynyl.
  • Cycloalkyl refers to a saturated or partially saturated, monocyclic or fused or spiro polycyclic, carbocycle preferably containing from 3 to 9 carbons per ring, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and the like, unless otherwise specified. It includes monocyclic system such as cyclohexyl, bicyclic systems such as decalin, and polycyclic systems such as adamantane. "Cycloalkylalkyl” means a cycloalkyl-alkyl- group in which the cycloalkyl and aikyl moieties are as previously described. Exemplary monocycloalkylalkyl groups include cyclopropylmethyl, cyclopentylmethyl, cyciohexylmethyl and cycloheptylmethyl.
  • Heterocycloalkyl refers to a saturated or partially saturated monocyclic, bicyclic or polycyclic ring containing at least a heteroatom selected from nitrogen, sulfur, oxygen, preferably from 1 to 3 heteroatoms in at least one ring. Each ring is preferably from 3 to 10 membered, more preferably 4 to 7 membered.
  • heterocycloalkyl substituents include pyrrolidyl, tetrahydrofuryl, tetrahydrothiofuranyl, piperidyl, piperazyl, tetrahydropyranyl, morphilino, 1,3-diazapane, 1 ,4-diazapane, 1 ,4-oxazepane, and 1 ,4-oxathiapane.
  • Heterocycloalkylalkyl refers to a heterocycloalkyl-alkyl group in which the heterocycloalkyl and alkyl moieties are as previously described.
  • exemplary heterocycloalkylalkyl groups include (2-tetrahydrofuryl)methyl, (2-tetrahydrothiofuranyl)methyl.
  • acyl means an alkyl-CO- group in which the alkyl group is as described herein.
  • examples of acyl include acetyl and benzoyl.
  • the alkyl group is preferably a C 1 -C 6 alkyl group.
  • Heteroalkyl refers to a straight- or branched-chain alkyl group preferably having from 2 to 14 carbons, more preferably 2 to 10 atoms in the chain, one or more of which has been replaced by a heteroatom selected from S, O, and N.
  • exemplary heteroalkyls include alkyl ethers, secondary and tertiary alkyl amines, alkyl sulfides, and the like.
  • Aryl as a group or part of a group denotes (i) an optionally substituted monocyclic, or fused polycyclic, aromatic carbocycle (ring structure having ring atoms that are all carbon) preferably having from 5 to 12 atoms per ring.
  • aryl groups include phenyl, naphthyl, and the like; (ii) an optionally substituted partially saturated bicyclic aromatic carbocyclic moiety in which a phenyl and a C 5-7 cycloalkyl or C 5-7 cycloalkenyl group are fused together to form a cyclic structure, such as tetrahydronaphthyl, indenyl or indanyl.
  • Arylalkyl means an aryl-alkyl- group in which the aryl and alkyl moieties are as previously described. Preferred arylalkyl groups contain a Ci-S alkyl moiety. Exemplary arylalkyl groups include benzyl, phenethyl and naphthelenemethyl.
  • heteroaryl either alone or part of another group refers to groups containing an aromatic ring (preferably a 5 or 6 membered aromatic ring) having 1 or more heteroatoms as ring atoms in the aromatic ring with the remainder of the ring atoms being carbon atoms. Suitable heteroatoms include oxygen, sulfur, and nitrogen.
  • heteroaryl examples include thiophene, benzothiophene, benzofuran, benzimidazole, benzoxazole, benzothiazole, benzisothiazole, naphtho[2,3-b]thiophene, furan, isoindolizine, xantholene, phenoxatine, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, indole, isoindole, 1H-indazole, purine, 4H-quinolidine, isoquinoline, quinoline, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, carbazole, phenanthridine, acridine, phenazine, thiazole, isothiazole, phenothiazine, oxazole, isoxazole, furazane
  • Heteroarylalkyl means a heteroaryl-alkyl group in which the heteroaryl and alkyl moieties are as previously described. Preferred heteroarylalkyl groups contain a C 1 to C 6 alkyl moiety. Exemplary heteroarylalkyl groups include pyridyl methyl.
  • Some of the compounds of the disclosed embodiments may exist as single stereoisomers, racemates, and/or mixtures of enantiomers and/or diastereomers. All such single stereoisomers, racemates and mixtures thereof are intended to be within the scope of the subject matter described and claimed.
  • formula (I) is intended to cover, where applicable, solvated as well as unsolvated forms of the compounds.
  • each formula includes compounds having the indicated structure, including the hydrated as well as the non-hydrated forms.
  • the HDAC inhibiting agents of the various embodiments include pharmaceutically acceptable salts, prodrugs, and active metabolites of such compounds, and pharmaceutically acceptable salts of such metabolites.
  • pharmaceutically acceptable salts refers to salts that retain the desired biological activity of the above-identified compounds, and include pharmaceutically acceptable acid addition salts and base addition salts.
  • Suitable pharmaceutically acceptable acid addition salts of compounds of formula (I) may be prepared from an inorganic acid or from an organic acid. Examples of such inorganic acids are hydrochloric, sulfuric, and phosphoric acid.
  • Appropriate organic acids may be selected from aliphatic, cycloaliphatic, aromatic, heterocyclic carboxylic and sulfonic classes of organic acids, examples of which are formic, acetic, propionic, succinic, glycolic, gluconic, lactic, malic, tartaric, citric, fumaric, maleic, alkyl sulfonic, arylsulfonic.
  • Suitable pharmaceutically acceptable base addition salts of compounds of formula (I) include metallic salts made from lithium, sodium, potassium, magnesium, calcium, aluminium, and zinc, and organic salts made from organic bases such as choline, diethanolamine, morpholine.
  • organic salts are: ammonium salts, quaternary salts such as tetramethylammonium salt; amino acid addition salts such as salts with glycine and arginine. Additional information on pharmaceutically acceptable salts can be found in Remington's Pharmaceutical Sciences, 19th Edition, Mack Publishing Co., Easton, PA 1995. In the case of agents that are solids, it is understood by those skilled in the art that the inventive compounds, agents and salts may exist in different crystalline or polymorphic forms, all of which are intended to be within the scope of the present invention and specified formulae.
  • Prodrug means a compound which is convertible in vivo by metabolic means (e.g. by hydrolysis, reduction or oxidation) to a compound of formula (I).
  • metabolic means e.g. by hydrolysis, reduction or oxidation
  • an ester prodrug of a compound of formula (I) containing a hydroxyl group may be convertible by hydrolysis in vivo to the parent molecule.
  • Suitable esters of compounds of formula (I) containing a hydroxyl group are for example acetates, citrates, lactates, tartrates, malonates, oxalates, salicylates, propionates, succinates, fumarates, maleates, methylene-bis- ⁇ -hydroxynaphthoates, gestisates, isethionates, di-p-toluoyltartrates, methanesulphonates, ethanesulphonates, benzenesulphonates, p-toluenesulphonates, cyclohexylsulphamates and quinates.
  • ester prodrug of a compound of formula I containing a carboxy group may be convertible by hydrolysis in vivo to the parent molecule.
  • ester prodrugs are those described by FJ. Leinweber, Drug Metab. Res., 18:379, 1987).
  • Administration of compounds within formula (I) to humans can be by any of the accepted modes for enteral administration such as oral or rectal, or by parenteral administration such as subcutaneous, intramuscular, intravenous and intradermal routes. Injection can be bolus or via constant or intermittent infusion.
  • the active compound is typically included in a pharmaceutically acceptable carrier or diluent and in an amount sufficient to deliver to the patient a therapeutically effective dose.
  • the inhibitor compound may be selectively toxic or more toxic to rapidly proliferating cells, e.g. cancerous tumors, than to normal cells.
  • terapéuticaally effective amount is an amount sufficient to effect beneficial or desired results.
  • An effective amount can be administered in one or more administrations.
  • An effective amount is typically sufficient to palliate, ameliorate, stabilize, reverse, slow or delay the progression of the disease state.
  • a therapeutically effective amount can be readily determined by a skilled practitioner by the use of conventional techniques and by observing results obtained in analogous circumstances. In determining the effective amount a number of factors are considered including the species of the patient, its size, age, general health, the specific disease involved, the degree or severity of the disease, the response of the individual patient, the particular compound administered, the mode of administration, the bioavailability of the compound, the dose regimen selected, the use of other medication and other relevant circumstances.
  • the compounds of the invention can be administered in any form or mode which makes the compound bioavailable.
  • One skilled in the art of preparing formulations can readily select the proper form and mode of administration depending upon the particular characteristics of the compound selected, the condition to be treated, the stage of the condition to be treated and other relevant circumstances. We refer the reader to
  • the compounds of the present invention can be administered alone or in the form of a pharmaceutical composition in combination with a pharmaceutically acceptable carrier, diluent or excipient.
  • a pharmaceutically acceptable carrier diluent or excipient.
  • the compounds of the invention while effective themselves, are typically formulated and administered in the form of their pharmaceutically acceptable salts as these forms are typically more stable, more easily crystallised and have increased solubility.
  • compositions which are formulated depending on the desired mode of administration.
  • the present invention provides a pharmaceutical composition including a compound of formula (I) and a pharmaceutically acceptable carrier, diluent or excipient.
  • the compositions are prepared in manners well known in the art.
  • kits comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention.
  • a pack or kit can be found a container having a unit dosage of the agent(s).
  • the kits can include a composition comprising an effective agent either as concentrates (including lyophilized compositions), which can be diluted further prior to use or they can be provided at the concentration of use, where the vials may include one or more dosages.
  • single dosages can be provided in sterile vials so that the physician can employ the vials directly, where the vials will have the desired amount and concentration of agent(s).
  • Associated with such container(s) can be various written materials such as instructions for use, or a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration.
  • the compounds of the invention may be used or administered in combination with one or more additional drug (s) that include chemotherapeutic drugs or HDAC inhibitor drugs and/or procedures (e.g. surgery, radiotherapy) for the treatment of the disorder/diseases mentioned.
  • additional drug s
  • the components can be administered in the same formulation or in separate formulations. If administered in separate formulations the compounds of the invention may be administered sequentially or simultaneously with the other drug(s).
  • the compounds of the invention may be used in a combination therapy. When this is done the compounds are typically administered in combination with each other. Thus one or more of the compounds of the invention may be administered either simultaneously (as a combined preparation) or sequentially in order to achieve a desired effect. This is especially desirable where the therapeutic profile of each compound is different such that the combined effect of the two drugs provides an improved therapeutic result.
  • compositions of this invention for parenteral injection comprise pharmaceutically acceptable sterile aqueous or nonaqueous solutions, dispersions, suspensions or emulsions as well as sterile powders for reconstitution into sterile injectable solutions or dispersions just prior to use.
  • suitable aqueous and nonaqueous carriers, diluents, solvents or vehicles include water, ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils (such as olive oil), and injectable organic esters such as ethyl oleate.
  • Proper fluidity can be maintained, for example, by the use of coating materials such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants.
  • compositions may also contain adjuvants such as preservative, wetting agents, emulsifying agents, and dispersing agents. Prevention of the action of micro-organisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents such as sugars, sodium chloride, and the like. Prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents that delay absorption such as aluminium monostearate and gelatin.
  • the compounds can be incorporated into slow release or targeted delivery systems such as polymer matrices, liposomes, and microspheres.
  • the injectable formulations can be sterilized, for example, by filtration through a bacterial- retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions that can be dissolved or dispersed in sterile water or other sterile injectable medium just prior to use.
  • Solid dosage forms for oral administration include capsules, dragees, tablets, pills, powders, and granules.
  • the active compound is mixed with at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl
  • compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.
  • the solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions which can be used include polymeric substances and waxes.
  • the compounds can be incorporated into slow release or targeted delivery systems such as polymer matrices, liposomes, and microspheres.
  • the active compounds can also be in microencapsulated form, if appropriate, with one or more of the above-mentioned excipients.
  • Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, solutions, suspensions, syrups and elixirs.
  • the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1 ,3-butylene glycol, dimethyl formamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof.
  • inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifier
  • the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.
  • adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.
  • Suspensions in addition to the active compounds, may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminium metahydroxide, bentonite, agar-agar, and tragacanth, and mixtures thereof.
  • suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminium metahydroxide, bentonite, agar-agar, and tragacanth, and mixtures thereof.
  • compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at room temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.
  • suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at room temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.
  • Dosage forms for topical administration of a compound of this invention include powders, patches, sprays, ointments and inhalants.
  • the active compound is mixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives, buffers, or propellants which may be required.
  • a preferred dosage will be a range from about 0.01 to 300 mg per kilogram of body weight per day.
  • a more preferred dosage will be in the range from 0.1 to 100 mg per kilogram of body weight per day, more preferably from 0.2 to 80 mg per kilogram of body weight per day, even more preferably 0.2 to 50 mg per kilogram of body weight per day.
  • a suitable dose can be administered in multiple sub-doses per day.
  • the compounds of the embodiments disclosed inhibit histone deacetylases.
  • the enzymatic activity of a histone deacetylase can be measured using known methodologies [Yoshida M. et al, J. Biol. Chem., 265, 17174 (1990), J. Taunton et al, Science 1996 272: 408].
  • the histone deacetylase inhibitor interacts with and/or reduces the activity of more than one known histone deacetylase in the cell, which can either be from the same class of histone deacetylase or different class of histone deacetylase.
  • the histone deacetylase inhibitor interacts and reduces the activity of predominantly one histone deacetylase, for example HDAC-1 , HDAC-2, HDAC-3 or HDAC-8, which belongs to Class I HDAC enzymes [De Ruijter A.J. M. et al, Biochem. J., 370, 737-749 (2003)].
  • HDACs can also target nonhistone substrates to regulate a variety of biological functions implicated in disease pathogenesis. These non-histone substrates include Hsp90, ⁇ -tubulin, p53, NFkb and HIFIa [Drummond et al., Annu. Rev. Pharmacol. Toxicol. 45:495 (2004)].
  • Certain preferred histone deacetylase inhibitors are those that interact with, and/or reduce the activity of a histone deacetylase which is involved in tumorigenesis, and these compounds may be useful for treating proliferative diseases.
  • Examples of such cell proliferative diseases or conditions include cancer (include any metastases), psoriasis, and smooth muscle cell proliferative disorders such as restenosis.
  • the inventive compounds may be particularly useful for treating tumors such as breast cancer, colon cancer, lung cancer, ovarian cancer, prostate cancer, head and/or neck cancer, or renal, gastric, pancreatic cancer and brain cancer as well as hematologic malignancies such as lymphoma and leukemias.
  • inventive compounds may be useful for treating a proliferative disease that is refractory to the treatment with other chemotherapeutics; and for treating hyperproliferative condition such as leukemias, psoriasis and restenosis.
  • compounds of this invention can be used to treat pre-cancer conditions or hyperplasia including familial adenomatous polyposis, colonic adenomatous polyps, myeloid dysplasia, endometrial dysplasia, endometrial hyperplasia with atypia, cervical dysplasia, vaginal intraepithelial neoplasia, benign prostatic hyperplasia, papillomas of the larynx, actinic and solar keratosis, seborrheic keratosis and keratoacanthoma.
  • pre-cancer conditions or hyperplasia including familial adenomatous polyposis, colonic adenomatous polyps, myeloid dysplasia, endometrial dysplasia, endometrial hyperplasia with atypia, cervical dysplasia, vaginal intraepithelial neoplasia, benign prostatic hyperplasia, papillomas of the
  • compounds of the various embodiments disclosed herein may be useful for treating neurodegenerative diseases, and inflammatory diseases and/or immune system disorders.
  • the disorder is preferably selected from the group consisting of cancer, inflammatory diseases and/or immune system disorders (e.g. rheumatoid arthritis, systemic lupus erythematosus), angiofibroma, cardiovascular diseases, fibrotic diseases, diabetes, autoimmune diseases, chronic and acute neurodegenerative disease like Huntington's disease, Parkinson's disease, disruptions of nerval tissue and infectious diseases like fungal, bacterial and viral infections.
  • the disorder is a proliferative disorder.
  • histone deacetylase inhibitors of the invention have significant antiproliferative effects and promote differentiation, cell cycle arrest in the G1 or G2 phase, and induce apoptosis.
  • the agents of the various embodiments may be prepared using the reaction routes and synthesis schemes as described below, employing the techniques available in the art using starting materials that are readily available.
  • the preparation of particular compounds of the embodiments is described in detail in the following examples, but the artisan will recognize that the chemical reactions described may be readily adapted to prepare a number of other agents of the various embodiments.
  • the synthesis of non-exemplified compounds may be successfully performed by modifications apparent to those skilled in the art, e.g. by appropriately protecting interfering groups, by changing to other suitable reagents known in the art, or by making routine modifications of reaction conditions.
  • a list of suitable protecting groups in organic synthesis can be found in T.W. Greene and P. G. M. Wuts 1 Protective Groups in Organic Synthesis, 3rd Edition, Wiley-lnterScience, 1999.
  • other reactions disclosed herein or known in the art will be recognized as having applicability for preparing other compounds of the various embodiments.
  • Reagents useful for synthesizing compounds may be obtained or prepared according to techniques known in the art.
  • the reactions set forth below were performed under a positive pressure of nitrogen, argon or with a drying tube, at ambient temperature (unless otherwise stated), in anhydrous solvents, and the reaction flasks are fitted with rubber septa for the introduction of substrates and reagents via syringe. Glassware was oven-dried and/or heat-dried. Analytical thin-layer chromatography was performed on glass-backed silica gel 60 F 254 plates (E Merck (0.25 mm)) and eluted with the appropriate solvent ratios (v/v). The reactions were assayed by TLC and terminated as judged by the consumption of starting material.
  • the TLC plates were visualized by UV absorption or with a p-anisaldehyde spray reagent or a phosphomolybdic acid reagent (Aldrich Chemical, 20wt% in ethanol) which was activated with heat, or by staining in iodine chamber. Work-ups were typically done by doubling the reaction volume with the reaction solvent or extraction solvent and then washing with the indicated aqueous solutions using 25% by volume of the extraction volume (unless otherwise indicated). Product solutions were dried over anhydrous sodium sulfate prior to filtration, and evaporation of the solvents was under reduced pressure on a rotary evaporator and noted as solvents removed in vacuo. Flash column chromatography [Still et al, J. Org.
  • NMR spectra was recorded on a Bruker instrument operating at 400 MHz 1 and 13 C- NMR spectra was recorded operating at 100 MHz. NMR spectra are obtained as CDCI 3 solutions (reported in ppm), using chloroform as the reference standard (7.25 ppm and 77.00 ppm) or CD 3 OD (3.4 and 4.8 ppm and 49.3 ppm), or an internal tetramethylsilane standard (0.00 ppm) when appropriate. Other NMR solvents were used as needed.
  • Mass spectra were obtained using LC/MS either in ESI or APCI. All melting points are uncorrected.
  • SYNTHESIS Scheme 1 illustrates one method of preparing the compounds of the invention.
  • the imidazopyridine core structure was constructed by a condensation reaction using 4- bromo-2-aminopyridine I as one of the starting materials [J. Med. Chem. 1998, 41, 5108].
  • the hydroxymethyl group was introduced at the 3 position by reacting with formaldehyde to give the intermediate IV.
  • This intermediate IV was then subjected to Heck reaction condition in which the alkenyl ester Vl was produced.
  • the alcohol group in Vl was then oxidized to the aldehyde VII which was further converted to an aminoalkyl group under reductive amination conditions using sodium acetoxyborohydride.
  • the hydroxamic acid VIII was formed as described in the previous schemes.
  • Scheme 2 illustrates yet another method in preparing compounds of the invention.
  • the imidazopyridine core structure was constructed by the condensation reaction using 4- bromo-2-aminopyridine I as one of the starting material.
  • the alkenyl ester group was introduced at the 6-position by the Heck reaction.
  • This intermediate X was then subjected to a Mannich reaction in which the aminoalkyl group was introduced [J. Org. Chem. 1965, 30, 2403]. Without further workups and purifications, the crude material was converted into the hydroxamic acid VIII as described in the previous schemes.
  • Scheme 3 illustrates yet another method of preparing compounds of the invention.
  • the imidazopyridine core structure was constructed by the condensation reaction using 4- cyano-2-aminopyridine Xl as one of the starting material.
  • the alkenyl ester group was introduced at the 6-position by a series of common organic transformations (basic hydrolysis; esterification; DIBAL-H reduction; DMP oxidation and the Wittig reaction).
  • the intermediate XVII was then subjected to a Mannich reaction in which the aminoalkyl group was introduced [J. Org. Chem. 1965, 30, 2403]. Without further workups and purifications, the crude material was converted into the hydroxamic acid VIII as described in the previous schemes.
  • Scheme 4 illustrates yet another method in preparing compounds of the invention.
  • the imidazopyridine core structure was constructed by the condensation reaction using 4- bromo-2-aminopyridine Il as one of the starting material.
  • the alkenyl ester group was introduced at the 6-position by the Heck reaction.
  • This intermediate XVII was then subjected to a Mannich reaction in which the aminoalkyl group was introduced [J. Org. Chem. 1965, 30, 2403]. Without further workups and purifications, the crude material was converted into the hydroxamic acid XVIII as described in the previous schemes. After purification by reversed-phase prep-HPLC, the intermediate VIII was subjected to reductive amination with the appropriate aldehydes to furnish the desired product.
  • Methyl acrylate (1.5 equiv) was added into a stirred suspension of the imidazopyridine III (1 equiv), Pd 2 (dba) 3 (0.02 equiv), P(O-ToI) 3 (0.05 equiv), Et 3 N (2.0 equiv) and CH 3 CN (0.3 M) at room temperature.
  • the reaction was heated to reflux at ⁇ 100 0 C.
  • the starting material had fully depleted (monitored by LCMS)
  • the reaction mixture was diluted with ethyl acetate.
  • the organic layer was then washed with NaHCO 3 and brine.
  • the organic layer was dried in Na 2 SO 4 before being filtered and concentrated in vacuo.
  • the crude product was purified by flash column chromatography.
  • the amine (3.0 equiv) was added slowly into a stirred solution of the imidazo[1,2- ⁇ jpyridinyl methyl ester X (1.0 equiv), formaldehyde solution (3.0 equiv) and AcOH (20 equiv) and the mixture was heated up to 50 0 C.
  • the starting material has fully depleted (monitored by LCMS), the crude product was used immediately for the next step.
  • the intermediate XVII was prepared according to the 3-steps procedure described in the general synthetic procedure by using appropriate starting materials. XVII was then subjected to reductive amination described below.
  • Example 28 3- ⁇ 2-tert-Butyl-3-ffcvclohexylmethyl-ethyl-amino ⁇ -methvn-imidazo[1,2-alpiridin-7- vD-N-hvdroxy-acrylamide (compound 28)
  • the titled compound was prepared according to the procedures described in the general synthetic procedure by using appropriate starting materials.
  • HPLC: 99 %; t R 1.699 min; LCMS (ESI) m/z 413 [MH] + .
  • Example 31 3-(3- ⁇ rEthyl-(2-ethyl-butyl)-amino1-methyl>-2-methyl-imidazo ⁇ ,2-a1pyridin-7-yl)-N- hvdroxy-acrylamide (compound 31)
  • the titled compound was prepared according to the procedures described in the general synthetic procedure by using appropriate starting materials.
  • Example 35 3-(2-tert-Butyl-3-(r(2-ethyl-butvn-methyl-amino1-methylV-imidazori,2-a1pyridin-7-yl)- N-hvdroxy-acrylamide (compound 35)
  • the titled compound was prepared according to the procedures described in the general synthetic procedure by using appropriate starting materials.
  • the titled compound was prepared according to the procedures described in the general
  • the titled compound was prepared according to the procedures described in the general
  • Example 62 3-r3-ftert-Butylamino-methyl)-2-ethyl-imidazon,2-a1pyridin-7-v ⁇ -N-hvdroxy- acrylamide (compound 62)
  • the titled compound was prepared according to the procedures described in the general synthetic procedure by using appropriate starting materials.
  • 1 H NMR (CD 3 OD): ⁇ 8.64 (d, J 6.9 Hz, 1 H), 7.94 (s, 1 H) 1
  • Table 1 shows the compounds that have been synthesized.
  • Human cDNA library was prepared using cultured SW620 cells. Amplification of human HDAC1 coding region from this cDNA library was cloned separately into the baculovirus expression pDEST20 vector (GATEWAY Cloning Technology, Invitrogen Pte Ltd). The pDEST20-HDAC1 construct was confirmed by DNA sequencing. Recombinant baculovirus was prepared using the Bac-To-Bac method following the manufacturer's instruction (Invitrogen Pte Ltd). Baculovirus titer was determined by plaque assay to be about 10 8 PFU/ml.
  • the purified GST-HDAC1 protein was dialyzed with HDAC storage buffer containing 1OmM Tris, pH7.5, 10OmM NaCI and 3mM MgCI 2 . 20% Glycerol was added to purified GST-HDAC1 protein before storage at -8O 0 C.
  • the assay has been carried out in 96 well format and the BIOMOL fluorescent-based
  • HDAC activity assay has been applied.
  • the reaction composed of assay buffer, containing 25 mM Tris pH 7.5, 137 mM NaCI, 2.7 mM KCI, 1 mM MgCI 2 , 1 mg/ml BSA, tested compounds, an appropriate concentration of HDAC1 enzyme, 500 uM Flur de lys generic substrate for HDAC1 enzyme and subsequently was incubated at room temperature for 2 h. Flur de lys Developer was added and the reaction was incubated for 10 min. Briefly, deacetylation of the substrate sensitizes it to the developer, which then generates a fluorophore. The fluorophore is excited with 360 nm light and the emitted light (460 nm) is detected on a fluorometric plate reader (Tecan Ultra Microplate detection system, Tecan Group Ltd.).
  • IC 50 is defined as the concentration of compound required for 50% inhibition of HDAC enzyme activity.
  • Human cancer cell lines (e.g. Colo205) were obtained from ATCC. Colo205 cells were cultivated in RPMI 1640 containing 2 mM L-Glutamine, 5% FBS, 1.0 mM Na Pyruvate. Colo205 cells were seeded in 96-wells plate at 5000 cells per well. The plates were incubated at 37 0 C, 5% CO 2 , for 24 h. Cells were treated with compounds at various concentrations for 96 h. Cell growth was then monitored using CyQUANT* cell proliferation assay (Invitrogen Pte Ltd). Dose response curves were plotted to determine GI 50 values for the compounds using XL-fit (ID Business Solution, Emeryville, CA). Gl 50 is defined as the concentration of compound required for 50% inhibition of cell growth.
  • Metabolic stability measurements in vitro using liver microsomes aids in the prediction of in vivo hepatic clearance and compound stability towards phase I biotransformation reactions mediated by P450 isozymes.
  • HLM human liver microsome
  • test compound 5 ⁇ M or control compound (Verapamil)
  • NADPH-generating system solution A 25 mM NADP + , 66 mM glucose-6- phosphate, 66 mM MgCI 2 in H 2 O
  • NADPH-generating system solution B 40 U/ml glucose-6-phosphate dehydrogenase in 5 mM sodium citrate
  • 1.0 mg/ml microsomal protein respectively, in 100 mM potassium phosphate buffer (pH 7.4). Samples are incubated for 0, 5, 15, 30, 45, 60min.
  • the measured in vitro T 1/2 >60 mins for the above compounds signifies that the contribution towards the in vivo clearance of the compound due to metabolism is expected to be low. This may result in a longer half-life and increased in vivo exposure of the compounds.
  • the efficacy of the compounds of the invention can then be determined using in vivo animal xenograft studies.
  • the animal xenograft model is one of the most commonly used in vivo cancer models.
  • mice Female athymic nude mice (Harlan), 12-14 weeks of age would be implanted subcutaneously in the flank with 5 x 10 6 cells of HCT116 human colon tumor cells, or with 5 x 10 6 cells of A2780 human ovarian tumor cells, or with 5 x 10 6 cells of PC3 prostate cancer cells.
  • the xenograft nude mice When the tumor reaches the size 100 mm 3 , the xenograft nude mice would be paired-match into various treatment groups.
  • the selected HDAC inhibitors would be dissolved in appropriate vehicles and administered to xenograft nude mice intraperitoneally, intravenously or orally daily for 14-21 days.
  • the dosing volume will be 0.01 ml/g body weight.
  • Paclitaxol used as positive control, will be prepared for intravenous administration in an appropriate vehicle.
  • the dosing volume for Paclitaxol will be 0.01 ml/g body weight.
  • Compounds of this invention that are tested would show significant reduction in tumor volume relative to controls treated with vehicle only. Acetylated histone relative to vehicle treated control group when measured shall be accumulated. The result will therefore indicate that compounds of this invention are efficacious in treating a proliferative disease such as cancer.

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Abstract

La présente invention concerne des composés d'hydroxamate qui sont des inhibiteurs d'histone désacétylase. La présente invention concerne plus particulièrement des composés contenant l'imidazo[1,2-a]pyridine et leurs procédés de préparation. Ces composés peuvent être utiles en tant que médicaments pour le traitement de troubles prolifératifs, ainsi que d'autres maladies impliquant des enzymes ayant des activités d'histone désacétylase (HDAC), ou bien apparentées ou associées à celles-ci.
PCT/SG2006/000277 2006-09-20 2006-09-20 COMPOSÉS D'HYDROXYMATE D'IMIDAZO[l,2-a]PYRIDINE QUI SONT DES INHIBITEURS D'HISTONE DÉSACÉTYLASE WO2008036046A1 (fr)

Priority Applications (3)

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ES06784289.8T ES2561835T3 (es) 2006-09-20 2006-09-20 Compuestos hidroxamato de imidazo[1,2-a]piridina que son inhibidores de la histona desacetilasa
EP06784289.8A EP2064211B1 (fr) 2006-09-20 2006-09-20 Composés d'hydroxymate d'imidazo[1,2-a]pyridine qui sont des inhibiteurs d'histone désacétylase
PCT/SG2006/000277 WO2008036046A1 (fr) 2006-09-20 2006-09-20 COMPOSÉS D'HYDROXYMATE D'IMIDAZO[l,2-a]PYRIDINE QUI SONT DES INHIBITEURS D'HISTONE DÉSACÉTYLASE

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WO2010043953A3 (fr) * 2008-10-15 2011-03-24 Orchid Research Laboratories Ltd. Nouveaux composés cycliques pontés en tant qu'inhibiteurs de l'histone désacétylase
EP3769757A3 (fr) * 2013-10-18 2021-10-06 The General Hospital Corporation Imagerie d'histone désacétylases au moyen d'un radiotraceur à l'aide de la tomographie par émission de positrons

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